Do these 3 things before closing this tab:
1Scan for outdated or missing drivers - takes under a minute2Clear out junk files and repair common Windows errors3Fix the driver behind crashes, sound loss and screen glitchesSet the browser viewport width and height before opening the page, then capture the visible viewport. In Playwright, that means page.setViewportSize() followed by page.screenshot(). Use fullPage: true only when the thumbnail is meant to show the entire scrollable page rather than the browser-sized view.
Capture a thumbnail at a specific width and height with Playwright
This JavaScript example opens Chromium, sets a 1200 × 800 CSS-pixel viewport before navigation, waits for the page load event, and saves the visible viewport as a PNG:
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const { chromium } = require('playwright');
(async () => {
const browser = await chromium.launch();
const page = await browser.newPage();
await page.setViewportSize({ width: 1200, height: 800 });
await page.goto('https://example.com', { waitUntil: 'load' });
await page.screenshot({
path: 'thumbnail.png',
fullPage: false,
scale: 'css',
});
await browser.close();
})();Install Playwright and its browser binaries in your project before running the script. Replace the example URL and dimensions with your target page and intended thumbnail size. The viewport values are in pixels; Playwright advises setting the viewport before navigation when possible because websites may adapt their layout as they load. See the Playwright Page API.
Set the viewport in the browser context instead
If every page in a browser context should use the same dimensions, pass the viewport when creating the context:
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const context = await browser.newContext({
viewport: { width: 1200, height: 800 },
});
const page = await context.newPage();
await page.goto('https://example.com');
await page.screenshot({ path: 'thumbnail.png', fullPage: false });This is useful for repeated captures at a fixed breakpoint. For a different breakpoint, set a different viewport or create another context. Playwright documents context viewport and device emulation in its Emulation guide.
Choose the right capture area and pixel scale
Viewport, full page, or clipped region
- Viewport screenshot: The default screenshot represents what fits in the current viewport. This is usually the right choice for a thumbnail.
- Full-page screenshot: Set
fullPage: trueto capture the full scrollable page. This produces a taller image, not a conventional fixed-size viewport thumbnail. - Clipped screenshot: Use the screenshot API’s
clipoption when you need a specific region rather than the whole viewport.
Playwright explains the difference between viewport and full-page images in its Screenshots guide.
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CSS pixels versus device pixels
The screenshot option scale controls output density. With scale: 'css', the image has one raster pixel per CSS pixel; with scale: 'device', output follows device pixels and can be larger on a high-density display. Choose CSS scale when the required output dimensions must match the configured viewport. Choose device scale when higher-density rendering matters more than a one-to-one output size.
When viewport size is not enough
A viewport defines the page’s layout area, but it does not by itself reproduce every aspect of a phone or other device. If the result depends on device scale factor, screen dimensions, or mobile behavior, configure the relevant context emulation options as well. Playwright’s device emulation documentation describes these settings and notes that a device profile’s viewport can be overridden.
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Capture several thumbnail sizes consistently
For breakpoint previews, capture each width and height deliberately rather than resizing an already-created image. A small helper keeps the viewport configuration explicit for each capture:
async function captureAt(page, url, width, height, path) {
await page.setViewportSize({ width, height });
await page.goto(url, { waitUntil: 'load' });
await page.screenshot({ path, fullPage: false, scale: 'css' });
}
await captureAt(page, 'https://example.com', 1200, 800, 'desktop.png');
await captureAt(page, 'https://example.com', 390, 844, 'narrow.png');The same URL can lay out differently at each viewport, so capture it anew after changing dimensions. If the intended output emulates a device rather than only a responsive breakpoint, configure that device’s other relevant settings too.
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Use Chrome DevTools Protocol for lower-level control
If you are issuing Chromium commands directly instead of using Playwright, the Chrome DevTools Protocol provides Page.setDeviceMetricsOverride for dimensions and device scale factor, and Page.captureScreenshot for the image. The capture command supports PNG, JPEG, and WebP, as well as clipping and a captureBeyondViewport option. Consult the Chrome DevTools Protocol Page reference for the current protocol details; its tot documentation is a rolling reference, so check compatibility with the Chromium version you use.
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- The page uses the wrong responsive layout: Set the viewport before calling
goto(). Also check whether you need mobile emulation rather than viewport dimensions alone. - The saved image has unexpected dimensions: Check
fullPage,scale, and anyclipsetting. CSS scale yields one output pixel per CSS pixel; device scale can yield a larger raster image. - The thumbnail cuts off content: A normal viewport screenshot intentionally captures only the visible area. Set
fullPage: truefor the entire scrollable page, or use clipping for a deliberate region. - The screenshot is captured before the page is ready: Navigation completion does not guarantee that every delayed image or client-rendered component has appeared. Wait for a relevant selector or an appropriate delay before capture; the right condition depends on the target site.
- Changing dimensions does not change the result as expected: Verify the size was set on the page or context used for that capture, and set it before navigation. For device-specific behavior, configure screen, device scale factor, and mobile behavior as needed.
Or skip the browser setup
ScreenshotNeo provides a one-request screenshot API. It removes cookie banners, newsletter popups, and chat widgets before capture; bot checks, blank pages, and failed loads are never billed. Its MCP server lets AI agents take screenshots, and the free plan includes 1,000 screenshots a month with no card; paid plans start at $5 for 3,000.
For API options and setup, see the ScreenshotNeo documentation. Example cURL request:
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curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://example.com -o shot.webpFor a custom viewport, add the viewport parameters supported by the API as described in its documentation. Visit ScreenshotNeo or sign up for 1,000 free screenshots a month with no card.
Frequently Asked Questions
Should I use full-page capture for a website thumbnail?
Usually not: use the normal viewport capture for a fixed-size preview. Choose full-page only when the thumbnail is intended to show the whole scrollable document.
Quick wins for a faster PC:
Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Clear out junk files and repair common Windows errorsFree Scan →Does a 1200 × 800 viewport always create a 1200 × 800 image?
With Playwright’s CSS scale, it produces one raster pixel per CSS pixel for a viewport capture. Device scale can produce a larger output, and full-page or clipped captures can change the final dimensions.
Quick Recap
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